Minneapolis Plumbing Question- Min Drain Size

[Joseph Lee]

This is a pretty specific question, but can someone tell me the minimum drain size required for a kitchen sink in Minneapolis? We're renovating a kitchen and had one plumber tell us 2.0", while my code research (section 420.3) tells me it's 1.5". 

Our drain is currently 1.5", and I don't want to have to tear into the wall if it's not necessary and I don't want to have any surprises me it comes to the final inspection for our building permit. I also have trouble internallizing pulling a permit and hiring out the work for a simple sink hookup. 

Also, if anyone has any plumber recommendations  in the area, I'd appreciate them. Thanks!